Option
A bit field that is used to configure the operation of the SPI interface. The bits are defined as:
| Field | Description |
|---|---|
|
7 Clock Phase (CPHA) |
0 = Data is changed on the first CLK edge and captured on the following edge.
|
|
6 Clock Polarity (CPOL) |
0 = The inactive state is low; 1 = The inactive state is high. |
|
5 Data Order |
0 = LSB first; 1 = MSB first |
|
4 Byte length |
0 = 8 bit and 1 =7 bit |
For example: Option field of &H60 Phase=0, Polarity=1, Data=1 and Length=0
Or Option field of &H30 Phase=0, Polarity=0, Data=1 and Length=1
The Diagram below demonstrates different SPI interface configurations and may be used to match the configuration needed for your specific sensor:
Source: https://commons.wikimedia.org/wiki/File:SPI_timing_diagram.svg
Type: Constant